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99dee823 | 1 | /* Copyright (C) 2005-2021 Free Software Foundation, Inc. |
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2 | Contributed by Jakub Jelinek <jakub@redhat.com>. |
3 | ||
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4 | This file is part of the GNU Offloading and Multi Processing Library |
5 | (libgomp). | |
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6 | |
7 | Libgomp is free software; you can redistribute it and/or modify it | |
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8 | under the terms of the GNU General Public License as published by |
9 | the Free Software Foundation; either version 3, or (at your option) | |
10 | any later version. | |
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11 | |
12 | Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
748086b7 | 14 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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15 | more details. |
16 | ||
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17 | Under Section 7 of GPL version 3, you are granted additional |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
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25 | |
26 | /* Provide target-specific access to the futex system call. */ | |
27 | ||
28 | #include <sys/syscall.h> | |
953ff289 | 29 | |
a68ab351 | 30 | static inline long |
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31 | sys_futex0 (int *addr, int op, int val) |
32 | { | |
33 | register long int gpr2 __asm__ ("2"); | |
34 | register long int gpr3 __asm__ ("3"); | |
35 | register long int gpr4 __asm__ ("4"); | |
36 | register long int gpr5 __asm__ ("5"); | |
37 | ||
38 | gpr2 = (long) addr; | |
39 | gpr3 = op; | |
40 | gpr4 = val; | |
41 | gpr5 = 0; | |
42 | ||
43 | __asm volatile ("svc %b1" | |
44 | : "=d" (gpr2) | |
45 | : "i" (SYS_futex), | |
46 | "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5) | |
47 | : "memory"); | |
a68ab351 | 48 | return gpr2; |
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49 | } |
50 | ||
51 | static inline void | |
52 | futex_wait (int *addr, int val) | |
53 | { | |
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54 | long err = sys_futex0 (addr, gomp_futex_wait, val); |
55 | if (__builtin_expect (err == -ENOSYS, 0)) | |
56 | { | |
57 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
58 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
59 | sys_futex0 (addr, gomp_futex_wait, val); | |
60 | } | |
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61 | } |
62 | ||
63 | static inline void | |
64 | futex_wake (int *addr, int count) | |
65 | { | |
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66 | long err = sys_futex0 (addr, gomp_futex_wake, count); |
67 | if (__builtin_expect (err == -ENOSYS, 0)) | |
68 | { | |
69 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
70 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
71 | sys_futex0 (addr, gomp_futex_wake, count); | |
72 | } | |
73 | } | |
74 | ||
75 | static inline void | |
76 | cpu_relax (void) | |
77 | { | |
78 | __asm volatile ("" : : : "memory"); | |
79 | } |